Lukas Brunner
Climate scientist @uni-hamburg.de: future projections, extremes, uncertainties | Formerly @ethz.ch @univie.ac.at | PhD @uni-graz.at | Python nerd | Hiking enthusiast
#SystemChangeNotClimateChange #OpenScience
More: https://lukasbrunner.github.io
- Letzte Woche durfte ich im Rahmen der Ringvorlesung zur Klimakrise der @uni-hamburg.de einen Vortrag zu den naturwissenschaftlichen Grundlagen der Klimakrise geben. Vielen Dank fürs Dabeisein und für die spannenden Fragen! Zum Nachschauen 👇 youtu.be/IuTXbtR1fFw #SystemChangeNotClimateChange
- Hier ist noch die Info zu der ganzen Vortragsreihe, mit super spannenden weiteren Themen: www.zfw.uni-hamburg.de/oeffentliche...
- Am kommenden Dienstag gebe ich im Rahmen der Ringvorlesung zur Klimakrise an der @uni-hamburg.de einen Vortrag zu den physikalischen Grundlagen der Klimakrise. Der Vortrag ist öffentlich, also gerne vorbeikommen! Freue mich auf den Austausch! #climatecomms www.zfw.uni-hamburg.de/oeffentliche...
- Vielen Dank für das Interesse und die angeregte Diskussion an alle die (online) dabei waren! Der Vortrag ist zum nachsehen jetzt auch auf YouTube 💻 Die zugehörigen Slides auf meiner Homepage: lukasbrunner.github.io/outreach youtu.be/IuTXbtR1fFw
- Comparing global km-scale climate models to the resolution of coarser CMIP6 models. The video shows precipitation flux and accumulated precipitation for 2025, ending with a quantification of the difference in resolutions. Animation: Michael Böttinger (DKRZ) Method & paper: bsky.app/profile/luka...
- New paper in ERL! We study the importance of resolution for the representation of climate extremes. We use a new generation of km-scale models to show that many important details about temperature and precipitation extremes are hidden at CMIP6-like resolutions. doi.org/10.1088/1748...
- Here's also my thread on the main findings: /profile/lukasbrunner.bsky.social/post/3lrsdhwkev22y
- 🌍New #ERL study shows how coarser 100km climate model grids miss key extremes – especially in mountains and tropics. 🏔️🌧️Using 10km resolution, researchers outline improved insights into temperature & precipitation extremes📊🔥 🔗 iopscience.iop.org/article/10.1...
- Amazing visualization of our recent sub-grid variability work by Michael Böttinger (DKRZ) 🤩. It shows the local detail in global precipitation resolved by km-scale models. From 0:50 in direct comparison to CMIP6-type 100km. From 2:07 the sub-grid variability is shown. 🤓🧪 youtu.be/fzA92tSF4ZM?...
- Here is the thread to the original publication: bsky.app/profile/luka...
- New paper in ERL! We study the importance of resolution for the representation of climate extremes. We use a new generation of km-scale models to show that many important details about temperature and precipitation extremes are hidden at CMIP6-like resolutions. doi.org/10.1088/1748...
- Local downpour near Oberstdorf, Germany ⛰️
- Vor einigen Wochen durfte ich im Rahmen des Formats Vorlesung für Alle der @uni-hamburg.de einen Vortrag zu Temperaturextremen geben. Die Aufzeichnung ist jetzt auf YouTube 👇 Danke für die Einladung und das Interesse! youtu.be/0KGi4Y6J2Ls?...
- Mehr zum Format und zukünftigen Vorlesungen: www.uni-hamburg.de/wissen-fuer-...
- Reposted by Lukas BrunnerToday is #ShowYourStripes Day! Created by @edhawkins.org, the warming stripes show temperature each year: blue for cool, white for avg, red for hot. Athletes are wearing them, knitters are knitting them, and cities are putting them on trams. Find + share your "stripes" here: showyourstripes.info
- Annually the impact of climate change is pretty clear even locally. And even on a daily basis the signal starts to emerge! For regular updates on daily Hamburg temperatures in a long term context, check out my bot @weather-climate.bsky.social (still 🚧) 2025 so far: bsky.app/profile/weat...
- Temperature anomaly relative to 1951-2010 in Hamburg, Germany #ShowYourStripes day #SystemChangeNotClimateChange
- Temperature anomaly relative to 1951-2010 in Hamburg, Germany #ShowYourStripes day #SystemChangeNotClimateChange
- Scary but fitting read for the occasion 🫣
- Reposted by Lukas BrunnerThe first 3 eps of TOTALLY COOKED have landed! Check it out for weather & climate in a factual, relatable & often humorous way. Available below, & where you get your podcasts. Like, follow & share. Let's tackle the climate crisis together. #totallycooked www.21centuryweather.org.au/engage/total...
- @cenunihh.bsky.social climate visualization lab has created this nice animation of the resolution effect on climate extremes! 🤩 Comparison of CMIP6-like 100km and the new 10km for the example of TXx (hottest day in the year). Details in the paper: doi.org/10.1088/1748... youtu.be/R5laSSVHUAk?...
- Reposted by Lukas BrunnerResolution matters: Extreme temperatures in e.g. Indian cities can be underestimated by up to 10°C, a paper by @lukasbrunner.bsky.social shows. High-res climate models (<10 km) reveal that important details about extremes are hidden at lower resolutions. iopscience.iop.org/article/10.1...
- New paper in ERL! We study the importance of resolution for the representation of climate extremes. We use a new generation of km-scale models to show that many important details about temperature and precipitation extremes are hidden at CMIP6-like resolutions. doi.org/10.1088/1748...
- We calculate extreme indices from two ~10km models (ICON & IFS). From them we quantify what information is lost at CMIP6-like resolutions of ~100km. To do so we introduce the concepts of sub-grid variability and sub-grid anomaly. Details in the paper: iopscience.iop.org/article/10.1...
- We focus on a subset of the 27 ETCCDI climate extreme indices in the paper. But we have published the full set of ETCCDI indices with 10km resolution globally at the World Data Center for Climate here: doi.org/10.26050/WDC...
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- Reposted by Lukas Brunner#EGU25 is about to start! If you're there, check out our session on High-impact Climate Extremes on Tuesday, room 🟨 F1 🧪: meetingorganizer.copernicus.org/EGU25/sessio... With many exciting talks, including the CL Division Outstanding ECS Award Lecture by @kornhuber.bsky.social
- Great workshop on atmospheric temperature changes by @wcrpclimate.bsky.social in Graz! Thanks for including me in this interesting and insightful exchange!
- 👀 Currently happening at Wegener Center: 20 international experts coming together in a workshop on Atmospheric Temperature Changes and their Drivers 🌏🌡️ as part of APARC (Amospheric Processes and their Role in Climate), a core project of @wcrpclimate.bsky.social 👉 www.aparc-climate.org
- Join us on Friday during #EGU25 for an interesting session on New developments in Earth system modelling! We will cover various topics from advances in modelling to model evaluation. We are also honored to have Shuting Yang as a solicited speaker! 👇 meetingorganizer.copernicus.org/EGU25/sessio...
- Reposted by Lukas BrunnerThis is genius! so creative and also important for how we communicate our science
- Reposted by Lukas BrunnerSuper excited to be presenting our ensemble boosting work, 'Imagine rain falling in a different place', in this session:
- Let me very warmly recommend putting our Up-Goer Five session into your EGU25 calendar! I mean, just have a look at these amazing abstract titles (using only the 1000 most used English words). I can guarantee that this will be an extremely informative and fun session! 🤓🧑🎓 #EGU25 @egu.eu
- In 2025 so far almost 20% of days in Hamburg have been warmer than the 90th percentile of the 1940-2024 climatology. More than 60% have been warmer than the mean.
- Apply for a scholarship for the European Forum Alpbach! Great opportunity for interesting discussions beyond topical silos. 🗣️🌎 There are several options for scholarships, if you are connected to Vorarlberg consider applying here: www.club-alpbach-vorarlberg.at/bewerbungspr...
- Reposted by Lukas BrunnerZum dreijährigen Geburtstag haben wir Klimadashboard.at und Klimadashboard.de neu gestaltet und mit vielen neuen Features ausgestattet: 💥 neues Design 📬 aktuelle Klimaberichterstattung 🇬🇧 english translations 🌚 dark mode 🚀 ...und vieles mehr!
- Reposted by Lukas BrunnerOn the migration of the scientific community to Bluesky: www.nature.com/articles/d41... 🧪
- Thanks for joining here!
- Klima ist was wir erwarten, Wetter ist was passiert. Aber der Klimawandel verändert immer weiter was wirklich passiert selbst lokal. Die tägliche Temperatur in Hamburg 2024 ist zwar sehr variabel aber klar zu warm wenn wir sie mit der Verteilung 1940-2023 vergleichen.
- Der Eindruck täuscht (leider) auch nicht: wenn wir die Temperaturverteilung in Hamburg 2024 im Vergleich zu 1940-2023 ansehen, finden wir fast ein Viertel aller Tage, die über dem 90. Perzentil liegen und damit die Definition für ein Hitzeextrem erfüllen.
- Wenn wir herauszoomen und auf ganz Nordeuropa schauen steigt die Zahl der Tage mit Hitzeextrem sogar auf in Drittel! Etwa 7% der Tage waren wärmer als der gleiche Tag im Jahr im gesamten ERA5 Datensatz.
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View full threadIch nehme das 'fast' zurück... 2024 waren alle Tage wärmer als das 90. Perzentil des jeweils gleichen Tages im Jahr.
- The 2024 climate summary reports are out and records are falling left and right. I'm adding this as I haven't seen it anywhere else: globally all days were warmer than the 90th percentile of the 1940-2023 distribution and more than half set a new record compared to the same day in previous years. 🥵
- The #EGU25 abstract deadline is approaching (Wednesday January 15th 1pm CET). If you are still looking for a session and work on evaluating climate models and/or observational constraints for their future projections, check out our session here: meetingorganizer.copernicus.org/EGU25/sessio...
- Are you working on climate model evaluation/improving future projections & their uncertainties at different scales? Join us at #EGU25 for an interesting session on Aggregating and constraining multi-model ensembles! meetingorganizer.copernicus.org/EGU25/sessio...
- I started this session last year as I felt the topic was not really covered at EGU and it was super interesting to hear all the different approaches presented! So even if you are not presenting consider joining and listening in to what will certainly be a very informative session again!
- Are you working on climate model evaluation/improving future projections & their uncertainties at different scales? Join us at #EGU25 for an interesting session on Aggregating and constraining multi-model ensembles! meetingorganizer.copernicus.org/EGU25/sessio...
- Reposted by Lukas BrunnerHier nochmal zum Nachgucken: Mein Jahresrückblick zum Wetter und Klima 2024.
- Hello Bluesky! Follow me for updates on my work 👨💻 (climate extremes, future climate projections & their uncertainties, climate model evaluation), climate outreach 🗣️, open science 🔓, and some mountains 🏔️ Follow my bot @weather-climate.bsky.social for the most recent updates of daily temperatures
- Pictures: - Paper on an error in temperature extreme metrics: bsky.app/profile/luka... - Paper on comparison of model evaluation & constraining methods: bsky.app/profile/luka... - Future of the Earth theatre: lukasbrunner.github.io/misc/tfote - Alpine crossing 2024 🏔️ / Hanauer Hütte 🇦🇹
- 🚨 New paper in @NatureComms We show that relative temperature extremes (TX90p) as used in many studies can be biased by as much as 50%! The bias arises from the use of too long seasonal windows and can easily be corrected. Details below 1/🧵 doi.org/10.1038/s414... 🧪
- A train tride between Hamburg and Bregenz later my old bot is now also here on the other side 🤓 Still some polishing to do but should be fully online soon 💪 Let me know if you're interested in a specific location, should be easy to add (on the @ecmwf.bsky.social ERA5 ~25km grid)
- Reposted by Lukas BrunnerEGU-goers, make this 🧨session happen with us at #EGU25 @eurogeosciences.bsky.social and explain your research in just the 1000 most common English words. The first European edition of the Up-Goer 5 challenge 🚀🚀 is a comms session so you can submit an extra abstract blogs.egu.eu/geolog/2024/...
- Can recommend!
- Not really sure if this is the right place to advertise a postdoc position related to high resolution models and high clouds (renewable for up to 6 years!), co-supervised by @aikovoigt.bsky.social and myself, but let's try to make this place a bit more lively, at least :)
- Reposted by Lukas BrunnerNow that we're all here 🫠 I want to invite you to something totally different at next years #EGU @eurogeosciences.bsky.social: The Upgoer Five Challenge! 🚀 Explain your research using only the 1000 most common words. Join us, it will be tons of fun & interesting! blogs.egu.eu/geolog/2024/...
- Do you (plan to) use Python in Earth sciences? We have a course for you at next year's #EGU: Introduction to Python for Earth System Sciences We'll cover the classics from matplotlib to xarray but happy for suggestions, just comment below! meetingorganizer.copernicus.org/EGU25/sessio...
